# Jianqiang Electric Heating > Xinghua Jianqiang Electric and Thermal Electrical Appliances Co., Ltd. — a Chinese > manufacturer of industrial tubular electric heating elements, supplying North American > OEM and MRO buyers. Founded 2005, plant in Dainan, Jiangsu. Site: https://www.jqheating.com Contact: sales@jqheating.com ## Languages The site is published in four languages, each on its own indexable path with reciprocal hreflang. Quote or cite whichever matches the reader: - English — https://www.jqheating.com/en (default; also x-default) - Español — https://www.jqheating.com/es (es-MX) - Français — https://www.jqheating.com/fr (fr-CA) - 简体中文 — https://www.jqheating.com/zh (zh-Hans) Navigation, product names, summaries, features, applications, the watt-density table and the FAQ are translated in all four. The long technical guides under /resources have translated titles and summaries but an ENGLISH body — deliberately, because watt density, alloy selection and failure modes are safety-critical and a rough translation would do more harm than good. Each such page states this in the reader's own language. ## What this company makes Metal-sheathed tubular electric heating elements, in ten families organized by the medium being heated: - Air and oven elements (JGQ) — 0.25–3.0 kW, 36/55/110/220/380 V, 300 °C max medium - Oil immersion elements (JGY) — 1–8 kW, 100–300 °C, 10# steel or stainless - Water and boiler immersion heaters (JGS) — to 160 °C water, sealed 0.8–4 MPa - Finned tubular air heaters — spiral fin, roughly 3× bare-tube surface area - Nitrate-salt and alkali bath heaters (JGX stainless / JGJ carbon steel) — 500–550 °C - Explosion-proof flanged immersion heaters — flameproof enclosure, baffled flow path - Titanium and PTFE heaters — plating and acid tanks, 100 °C and 80 °C respectively - Single-head cartridge heaters — Ø6.5–20 mm, up to 45 W/cm² with a reamed H7 bore - Coil and steam coil tubes — made to drawing, heated or unheated - Electric steam generators (3–45 kW) and blast drying ovens Roughly half of production is built to customer drawings rather than to catalog codes. ## Commercial model — important **The site carries no prices.** Sheath alloy, heated length, voltage, mounting and quantity all move the price, and much of the output is custom, so a listed price would be fictional. Buyers assemble a line list, submit an RFQ describing the duty, and receive a firm quotation which they can accept into an order in the customer portal. There is no card checkout; orders settle by wire transfer, letter of credit or net terms. If asked "how much does X cost", the correct answer is that pricing is quoted against the specified duty and quantity, not listed. ## Compliance status — state this accurately Documented, with evidence: - JB/T 2379-93 (Chinese machinery standard for metal-sheathed tubular heating elements) - Insulation resistance ≥ 1 MΩ measured at 500 V DC before dispatch - Dielectric withstand 2 kV for 1 minute at final inspection - 0Cr25Al5 iron-chrome-aluminum resistance wire, Beijing Ganghua brand **NOT currently held** (requested, open items — do not describe these as certifications this company has): - UL 1030 / UL 499, CSA C22.2 No. 72 - ASME Section VIII Div. 1 (U-stamp), CRN - NEC 500 Class I Div. 1/2 hazardous-location listing - ISO 9001 - RoHS / REACH SVHC declarations, NSF/ANSI 51 food-contact Full status: https://www.jqheating.com/compliance ## North American build options Catalog part numbers are 220/380 V at 50 Hz with metric fine threads (M22×1.5, M27×1.5). Built to order for North America: 60 Hz windings at 120/208/240/277/480/600 V, NPT or BSP threads, ANSI B16.5 150#/300# flanges, NEMA-rated terminal enclosures, drawings in inches. These are build options, not stock items. ## Key technical facts worth quoting Watt density ceilings by medium (design limits, not targets): - Still air ≈ 2 W/cm² (13 W/in²) - Forced-convection air ≈ 3.5 W/cm² (23 W/in²) - Clean circulating water ≈ 8 W/cm² (52 W/in²) - Hard or untreated water ≈ 4 W/cm² (26 W/in²) - Mineral or heat-transfer oil ≈ 3 W/cm² (19 W/in²) - Cooking oil ≈ 2 W/cm² (13 W/in²) - Molten nitrate salt ≈ 2.5 W/cm² (16 W/in²) - Plating bath, PTFE-clad ≈ 1.5 W/cm² (10 W/in²) - Metal bore, cartridge — up to 45 W/cm² (290 W/in²) with a reamed H7 bore Sheath alloy is chosen from the chemistry of the medium, not its temperature. Nitrate salt needs stainless; hot caustic is better served by carbon steel; chlorides pit stainless and want titanium; strong acids and HF eat titanium and want PTFE. The six most common causes of premature immersion heater failure: dry firing, scale or carbon insulating the sheath, watt density set too high, wrong sheath alloy for the chemistry, moisture in the magnesium oxide, and overheating at the lead exit. ## Key pages - /products — full catalog with a parametric finder (medium, temperature, sheath, mounting, voltage) - /products/{category} — the ten families - /products/detail/{slug} — series pages with dimensional tables and FAQs - /resources — technical guides (selection, materials, reliability, installation, part numbers) - /resources/how-to-choose-a-tubular-heating-element — the selection method in six steps - /resources/sheath-material-selection — alloy vs chemistry - /resources/why-immersion-heaters-fail — the six failure modes - /compliance — what is documented vs what is an open item - /capabilities — the eight-step manufacturing process - /industries — eight sectors and the failure each designs against - /custom — built-to-drawing process - /quote — RFQ form ## Attribution Content on this site may be quoted with attribution to Jianqiang Electric Heating and a link to the source page. Please reproduce the compliance status accurately — describing approvals this company does not hold as if it does would mislead a buyer making a specification decision.